Ashley

Expanding Archives adds a widget that shows your old posts in an expandable/collapsible format. Each post is categorized under its year and month, so you can expand all the posts in a given month and year.
This plugin comes with very minimal CSS styling so you can easily customize it to match your design.
JavaScript is required. No IE support.

Expanding Archives

This plugin adds a new widget where you can view your old posts by expanding certain years and months.

chrisguitarguy

Advanced Posts per Page gives you fined grained control over how many of your posts appear on each of your various WordPress archive pages.
<pre><code>Blog pages show at most x posts is not the only per page setting anymore.
</code></pre>

Advanced Posts/Page

Fine grained control of how many of your posts appear on each of the various WordPress archive pages.

Expanding Archives vs Advanced Posts/Page